Id love to see a Castle and Continuum crossover :D

Just like the title suggests, I know the series's aren't totally theme compatible, but Id love to see it. It would play into castle's sense of make believe fun, thinking oooooo shes a time traveling person from the future ..... no one would ofc believe him and yet it would ofc be true . What do you guys think?, or even better what shows do you think that would make a great crossover?